回复：转帖一道看似简单的“超超难”智力题

来源: 于 2008-09-23 10:36:24 [旧帖] [给我悄悄话] 本文已被阅读：次

A(0)---------x-----------------y---------B(1000)

The driver first takes 2 persons to y and go back to meet other 2 person at x, and then all person arive B at same time.

we have 2 equastions:

y/10 +1000-y = y/10+(y-x)/10+(1000-x)/10
x+(1000-x)/10 = y/10+(y-x)/10+(1000-x)/10